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#1
July 31st 05, 03:44 AM
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"Mike Rapoport" wrote in message hlink.net... " Blueskies" wrote in message m... "Matt Whiting" wrote in message ... Mike Rapoport wrote: Spoilers function the same as ailerons at low angles of attack and better than ailerons at high angle of attack. The primary advantage of spoilers instead of ailerons is that it enables full span flaps. Spoilers also reduce or eliminate adverse yaw. I assume there must be some disadvantages of spoilers for roll control as you see them so rarely. What are the drawbacks? Cost?? Matt What happens when the wing is inverted? If you are pushing negative Gs then the roll control will be reversed? It would work the same. The wing doesn't know that it is inverted, all it knows is AOA. Mike MU-2 The wing does know, the AOA is negative. Right side up, the spoiler is deflected and the wing drops. Turn it upside down and deflect it, the wing still drops. 
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#2
July 31st 05, 03:59 AM
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" Blueskies" wrote in message m... "Mike Rapoport" wrote in message hlink.net... " Blueskies" wrote in message m... "Matt Whiting" wrote in message ... Mike Rapoport wrote: Spoilers function the same as ailerons at low angles of attack and better than ailerons at high angle of attack. The primary advantage of spoilers instead of ailerons is that it enables full span flaps. Spoilers also reduce or eliminate adverse yaw. I assume there must be some disadvantages of spoilers for roll control as you see them so rarely. What are the drawbacks? Cost?? Matt What happens when the wing is inverted? If you are pushing negative Gs then the roll control will be reversed? It would work the same. The wing doesn't know that it is inverted, all it knows is AOA. Mike MU-2 The wing does know, the AOA is negative. Right side up, the spoiler is deflected and the wing drops. Turn it upside down and deflect it, the wing still drops. No. The wing is pushing the air down to keep the plane up. If the spoiler is extended on an inverted wing, turbulence is created behind the spoiler and air is not pushed down as effectively. Although I have never flown inverted, I have pushed the nose over to the point of negative Gs and roll control is not reversed. Mike MU-2
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